If you are using OpenSSH (which is not the only implementation of SSH and not the only program named ssh, though I'd expect the most common among githubians who are almost by definition FOSSites) versions 6.5 to 8.1 prefer ecdsa then ed25519 (unless using an OpenSSL version that doesn't support ECC, or not using OpenSSL at all) only 8.2 up prefer ed25519 first. Which one is used for a given connection depends on the capabilities and preferences of the client, namely your ssh program. Ylonen Request for Comments: 4253 SSH Communications Security Corp Category: Standards Track C. ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUs圜OV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJ元RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4圜E6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ= ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBEmKSENjQEezOmxkZMy7opKgwFB9nkt5YRrYMjNuG5N87uRgg6CLrbo5wAdT/y6v0mKV0U2w0WZ2YB/++Tpockg= The protocol implementation is based on a full-strength general purpose cryptographic library, which can also be used stand-alone. ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIOMqqnkVzrm0SdG6UOoqKLsabgH5C9okWi0dh2l9GKJl OpenSSL is a robust, commercial-grade, full-featured Open Source Toolkit for the Transport Layer Security (TLS) protocol formerly known as the Secure Sockets Layer (SSL) protocol. has all three currently-accepted types of host key, presumably for maximum interoperability (especially since it costs them nothing to do so): $ for t in ed25519 ecdsa rsa do ssh-keyscan -t $t 2>/dev/null done One day I felt the need to write a bash script to automate git operations with github through SSH, mainly to avoid repeatedly typing the same commands. In order to provide a public key, each user in your system must generate one if they dont already have. If you downloaded the OpenSSH beta from the GitHub repo at PowerShell/Win32-OpenSSH, follow the instructions listed there, not the ones in this article.Some information in the Win32-OpenSSH repository relates to prerelease product that may be substantially modified before it's released. First, neither ECDSA nor Ed25519 (EdDSA) is an encryption scheme or algorithm they are both signature algorithms (or schemes) used in SSH as host authentication (aka host-key) algorithms or methods, as well as 'user' authentication. Many Git servers authenticate using SSH public keys.
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